A plume of toxic-laden groundwater has migrated from the site in Pompton Lakes.

Mitsu Yasukawa/The Star-LedgerBob Williams, left, and Lou Ballini prepare a remote control boat for testing on the water at Hershfield Park in Pompton Lakes in this 2002 file photo. A plume of toxic-laden groundwater has migrated from the site in Pompton Lakes.The state Health Department issued a study showing elevated rates of kidney cancer among woman and non-Hodgkin's lymphoma in men in the neighborhood above the groundwater plume.

The report could not conclusively link the cancers to the solvents that are contaminating the groundwater.

The solvents had been used at the factory in the northern end of the Passaic County town, which operated from the late 1800s until it was closed in 1994.

DuPont spokesman Robert Nelson said the company is working with experts to study groundwater cleanup methods.